Question

explain the trend in atomic radii of d block element

Answer 1

atomic radius in d block initially decreases then remains constant and finally increases at the end.


Over all trend can be explained based two factors that are working there, nuclear attractions and inter electronic repulsions, where one supports decrease in atomic radii and the other increase in atomic radii, respectively.

As we are moving from Sc to Zn , initially one factor nuclear charge increases as the new electrons coming and entering into same orbital that to inner one, as the number of electrons are low in the inner shell and the shielding power of d orbial is low, inter electronic repulsions will be operating less than nuclear charge, which results in decrease in atomic radii.

In the middle these two factors mostly operating equal, which results in consistency in size.

In the end, as the number of electrons in the inner orbital increases the outer electrons feel better repulsions and slightly pushed away. though d orbital has less shielding power, the number of electrons are too high to make the electronic repulsion as more dominant factor at the end, which results in increase in the atomic radii.


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